6 books in series

Wayside School

Wayside School is a 5-book series with 6 primary works first released in 1989 with contributions by Louis Sachar.

Sideways Stories from Wayside School
Wayside School Is Falling Down
Sideways Arithmetic from Wayside School
More Sideways Arithmetic From Wayside School
Wayside School Gets a Little Stranger
Wayside School Beneath the Cloud of Doom